navy crime yard. interviewing witnesses. peter doocy was with us at this hour yesterday. one of the first reporters on the scene. peter, good morning to you. do we know how aaron alexis got those guns inside the navy yard? >> reporter: the fbi is trying to figure that out. what we do know is mr. alexis had multiple guns on him as he committed mass murder about this time yesterday. the authorities say at least one of those weapons was taken by mr. alexis from a law enforcement officer on the yard. >> apparently he used the handgun of one of the law enforcement officials in the navy yard after he got there. so that investigation is continuing to unfold to see what weapons he had, how many weapons